TY - JOUR
T1 - Statistical dispersion relation for spatially broadband fields
AU - Shan, Mingguang
AU - Nastasa, Viorel
AU - Popescu, Gabriel
N1 - Funding Information:
National Science Foundation (NSF) (CBET-0939511 STC, IIP-1353368); National Natural Science Foundation of China (NSFC) (61377009), China Scholarship Council (CSC) (201506685053); Fundamental Research Funds for the Central Universities of China; Fulbright Senior Postdoctoral Program 2015-2016.
Publisher Copyright:
© 2016 Optical Society of America.
PY - 2016/6/1
Y1 - 2016/6/1
N2 - The dispersion relation is fundamental to a physical phenomenon that develops in both space and time. This equation connects the spatial and temporal frequencies involved in the dynamic process through the material constants. Electromagnetic plane waves propagating in homogeneous media are bound by simple dispersion relation, which sets the magnitude of the spatial frequency, k, as being proportional to the temporal frequency, ω, with the proportionality constant dependent on the refractive index, n, and the speed of light in vacuum, c. Here we show that, for spatially broadband fields, an analog dispersion relation can be derived, except in this case the k-vector variance is connected with the temporal frequency through the statistics of the refractive index fluctuations in the medium. We discuss how this relationship can be used to retrieve information about refractive index distributions in biological tissues. This result is particularly significant in measurements of angular light scattering and quantitative phase imaging of biological structures.
AB - The dispersion relation is fundamental to a physical phenomenon that develops in both space and time. This equation connects the spatial and temporal frequencies involved in the dynamic process through the material constants. Electromagnetic plane waves propagating in homogeneous media are bound by simple dispersion relation, which sets the magnitude of the spatial frequency, k, as being proportional to the temporal frequency, ω, with the proportionality constant dependent on the refractive index, n, and the speed of light in vacuum, c. Here we show that, for spatially broadband fields, an analog dispersion relation can be derived, except in this case the k-vector variance is connected with the temporal frequency through the statistics of the refractive index fluctuations in the medium. We discuss how this relationship can be used to retrieve information about refractive index distributions in biological tissues. This result is particularly significant in measurements of angular light scattering and quantitative phase imaging of biological structures.
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U2 - 10.1364/OL.41.002490
DO - 10.1364/OL.41.002490
M3 - Article
C2 - 27244396
AN - SCOPUS:84975256633
SN - 0146-9592
VL - 41
SP - 2490
EP - 2492
JO - Optics Letters
JF - Optics Letters
IS - 11
ER -